Substation telephone instrument



- June 29 1926.

J. ERICKSON ET AL.

SUBSTTION` TELEPHONE INSTRUMENT 5 ShegetslShe'et 1 Filed April 5, 1922 Z Immber l Juhu Emckszm June 29 1926. 1,590,355

J. ERICKSON ET AL SUBSTATION TELEPHONE INSTRUMENT Filed April 5, 1922 5 Shvqetsfshe'et 2 En DI Herb-eff F. bEIJjJU-'ghn Emcksnn June 29 1926. 1,590,355

J. ERICKSON ET AL SUBSTATION TELEPHONE INSTRUMENT Filed April 5. 1922 I 5 Shee'CSShe'et 5 HEFBEF. ber Ell-53h11 E11/:kenn M. fm

June 29,1926.' L 1,590,355 J. ERICKSON ET AL SUBSTATION TELEPHONE INSTRUMENT Filed April 5. 1922 5 SheetVsShe`et 4 Fzg: E

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J. ERICKSON ET AL SUBSTATION TELEPHONE INSTRUMENT Filed April 5, 1922 5 Sheet.s5heet 5 FIEL' 955K TELEPHNE -Inuen Urs Patented June 229, 1926.

l UNITED STAT-Es 'PATENT OFFICE.

JonNnm'cxsoN, or CHICAGO, AND HERBERT I'. ernaar-ELL, or nrvnn. Foanrzs'r,

ILLINOIS, ABSIGNOBB, BY MESNE ASSIGNMENTS, T0 AUTOMATIC ELECTRIC INC.,l

OF CIIICAGO, ILLINOIS, A CORPORATION OF' DELAWARE.

SUBSTATION TELEPHONE INSTRUMENT.

Appiinqn :nea Aprii 5, 1922. semi 110.549.733.

` -The present invention relates to substation telephone instruments; and the principal object 'is the provision of a unitary proved fastener for the cover of a wall telephone or a bell box.

Other features will become ap arent upon a further perusal of the speci cation and, together with the features pointed out, will be explained fully hereinafter, reference being had to the accompanying drawings comprising Figs. 1-11, inclusive.

The drawings, Figs. 1-8, inclusive, show various views of an yautomatic wall telephone embodying the interchangeable base and the other features of the invention, while Figs.`

9-11, inclusive, are automatic substation circuit drawings.;` A I Referringnow particularly to Figs. 1-8, inclusive, Fig. 1 is a view of the wall telephone as seen from the left side; Fig. 2 is a view of the same telephone as seen from the `front; Fig. 3 is a front view of the lbase and parts attached thereto with the cover removed; Fig. 4 isa rear View of the removed cover to ether with the parts attached thereto; ig. 5 is a cross section of the base taken on the line AA of Fig. 3 with the ringer removed; Fig. 6 is a view of the improved cover fastener as seen from the right and in the position it assumes in Fig. 2;

Fig. 7 is a view of the improved switch hook support ast seen from the left and in they positlon it assumes in Fi 1;v and Fig. 8 is a detailed drawing showing how the termivnal strip 62, Fig. 4'is secured to the cover 3. It may be stated .that Figs. l and 2 are drawings having dimensions one-half those of the original model, while Figs. 3-8, inclusive, are full size.

Referring now particularly to Figs. 9, 10, and 11, which, as before stated, are circuit drawin s of an automatic telephone substation, ig. 9 is a-wiring diagram of a wall telephone, the on the base being s own on the right and the parts which are mounted on the cover being shown on the left; Fig. 10 is a wiring parts which are located bef diagram of an automatic desk telephone, the

- parts shown on the right being mounted on the base of the bell box and the parts shown on the left being located in the desk stand; and Fig. 11 is a schematic drawing showing more clearly the actual circuit used in Figs.

9 and l0.

Referrin now particularly to Figs`.i14,A inclusive, t e base 2 is a box shaped sheetI metal stamping and is provided with ythe necessary slots and openings as can be seen most readily in Fig. 3. The cover also is made of sheet metal and has a box like shape open in the rear into which a. raised portion of the base fits. The base 2 ma be secured to a support, a wall for examp e,'b means of screws which pass through the oles 38 and 39 and the slots 40 and 41, Fig. 3. The

cover 3 is hinged on the base 2 by means of the hinges 77 Vand 7 8 which are secured to the cover 3 by rivets. These hinges 77 andk 78 fit into the corresponding slots 45 and 46 punched in the base 2, Fig. 3. When the cover is in place and is standing open, it is v prevented from being lifted off the base by the catch 37, Fig. 3, which catch, when vpushed toa vertical position, prevents the hinge 7 8 from being moved up. When the cover 3 is swung shut, the tongue 74, Fig. 4, which is secured to the cover 3 by the bolt 9 and the associated nut, Fig. 6, comes into the slot 44 in the base, Fig. 3. When the screw 7 is turned inthe proper direction, the tongue 74 is moved towards the center of the base and the end catches the right hand edge of the slot 44, holding the cover firmly shut. The tongue 74 is seen most clearly in Fi 6. It ma be mentioned that the end .of e tongue 4 is bent so as to form an angle with'the main part thereof which is slightly greater than a right angle. This construction provides for drawing the cover closer/to the base as the screw 7 is turned further in and prevents any looseness that might otherwise be present. The washer 79, Fig. 4, revents the tongue 74 from being retracted far enou h to strike the opposite side of the slot 44, the cover is unlocked preparatory to openin it.

he cover 3 is punched at the bottom so as to form'a grating on either side. This gratin permits the sound of the ringer to y heard.

ig. 3, when The hook 5, which is secured to the cover 3 may be used as a hook on which to hang a telephone directory.

Referring now particularly to Fig. 3, the base'2 has the center portion cut away and the stidening edge 34 turned up. The ringer is secured to the edge 34 by means of the screws 32 and 33. The holes 35 and 36 near the bottom of the base give room for the gongs of the ringer. J ust above the ringer, the terminal strip 31 is mounted between the cable supports 25 and 26. lThe terminal strip 31` is provided with a number of `terminals, such as the terminal 27, secured thereto by hollow rivets, suchas the rivet 28, and is provided with the terminal screws, such as the terminal screws 29 and 30. This terminal strip 31, together with the cable supports 25 and 26, is mounted above the induction coil 82, as can be seen in Fig. 5. 'llhe brackets 23 and 24, which Support the induction coil 82, are secured to the base 2 by screws, as shown. The holes in the brackets 25`and 26, through which the screws pass which hold the brackets to the "base 2, are so made that the induction coil 82 and the parts securedq'thereto may be re? moved as a unit when one of' the bracket supporting screwsis removed and the other screw is loosened slightly'. This can be seen clearly in Fig. 3.

The condenser 21 is mounted above the terminal strip 31 in a box like cavity formed in the base2 by bending a portion of the same after it is properly out. This can 'be seen most clearly in Fig. 5. The bracket 22 is secured by screws over the top of the condenser 21 and holds the latter firmly l'in place.

Upon referring to 5, it will be noted that a protecting back 81 is provided for the base 2 and is secured to the latter by two i screws as shown. The back 81 fits into the hollow base 2 and in turn has a stamped depression or hollow inthe center to permit` the line wires that connect with the central exchange to be brought in between the back Iand the wall or other support 'to which the base 2 is secured. The line wires may pass behind the base and back, by way of either the upper notch 47 or the lower notch 48 cut in the base 2, and enter the telephone by way of thehole 49, Fig. 3, in the back 81.

Referring now particularly to Figs. 4 and 1, the wedged shaped cylinder'or thimble 4, most clearly seen in Fig. 1, is spot-welded te the cover 3. The calling device CD is secured to the outer end of this thimble by three screws, as shown in Fig. 4.

The terminal strip 62, Fig. 4, together `;-with the cableF supports y61 and 63 are fastened to the cover 3 by means of a bracket 64, Fig. 8, which bracket is fastened to the cover 3 bythe screws 75 and 76. The heads of the'screws 7B and '7G-.Bt into a hllowed out portion (not shown) of the transmitter base 12, Fig. 1, and the transmitter base 12 is secured to the cover 3 by the screws 65 and 66, Fig. 4.

The switch hook 6, and the springs inclusive,4 which are controlled thereby are shown in Fig. 4 in the position t they assume when the receiver is oli' the i switch hook, t-he switch hook 6 being held up by the heavy spring through the medium of the insulating bushing 69. The

switch hook/ support 67 is secured to the A' made long so as to enable the screw 68 tobe turned out far enough to permit the removal of the switch hook 6 before all the threads are disengaged. Thus the screw does not have to be entirely removed to dismount the hook and there is no dangerof losing it.

Referring now particularly to Figs. 9, 10 and 11, in which Fig. 9 is a wiring diagram of a wall telephone and Fio. 10'is a wiring diagram of a desk telephone, it will be seen that the wiring of the base of the wall telephone is the same as the wiring of the base of theY bell box of the desk telephone. Consequently, when a wall telephone is desired, a cover, such as shown in the present drawing, is placed on a base, such as is shown in the present drawings, and the two are wired in accordance with Fig. 9.` If a desk telephone is desired, a base identicalvrwith the one used for the base of the wall telephone, is equipped with a blank cover, and a desk stand, wired as shown in Fig. 10, is con? nected thereto by means of a cord containing the three inter-connecting conductors shown in Fig. 10. This interchangeableness of the base is made possible by the placing the parts of the wall telephone, thatcorrespond to the parts located on thev desk stand of a desk telephone, on the cover of the wall telephone, leaving on the base only the parts,

stated, is a simpliiied diagram which applies equally well to Figs. 9 and 10, and is of the so-called booster type. When the receiverA is removed, ,y the transmitter T is bridged across the line conductors throu h the impulse springs of the calling device D and `the lower winding of the in uction coil;

.foregoin will now be upon the closure of the right hand air of switch hook contacts. `When the le hand pair of switch hook contacts close, the receiver is bridged around the transmitter Td and the calling device impulse springs, in series with the upper winding of the induction coil and the condenser.

When the diall of the calling device CD is moved from its normal position by the Subscriber in calling a number .the three lower springs thereof makev contact with each other, thereb placing a shunt around the transmitter and another shunt around the receiver. This is the usual ex dient made use of in order to lower thel line resistance during dialling and in order to prevent the calling subscriber from hearing any unpleasant noises. The line circuit is interruptedthe desired number of times at the upper -or imulse sprin of the calling device as the ial thereo returns to normal position.

The various features of the invention, having been described and ascertained in lthe pointed ou't inthe nde claims:

at is claimedis:A

1. In combination, a base and a cover adapted to form a wall telephone box when assembled together, instrumentalities includ-` ing all the essentials of a desk telephone mounted on saidI cover, instrumentalities in- Y cluding all the essentials of adesk telephone ringer box mounted on said base, terminals on the said base and cover, respectively; and

s a cable temporarily connecting said terminals to form a complete wall telephone but adapted to be removed at will together 'with the said cover to permit the substitution of a blank cover andea separate desk telephone.

in order to form a complete desk telephone set struments mounted on said base and adaptltherefrom so as to form a complete d adapted to cooperate with the instrumentali-V ties mounted on said base to form a complete wall telephone set.

3; In combination, a base, a. rin r on saidv base, a terminal assembly on sai base havconnections extending to said r' r,

said vterminal bly serving to ena le' said base and/ringerto connected with a 2. In combination, an instrument base, in-l desk stand separate therefrom so as to form a complete desk telehone set, a cover for said base, and a switc hook and transmitter mounted on said cover, a receiver supported bv said switch hook,.tsaid terminal assembly n so serving to enable the ringer of said vbase to be connected into proper relation" to the said receiver and transmitter to form a complete wall telephone set.

4. A wall telephone including a base and cover, a desk telephone, the base of the wall telephone having a ringer, an induction coil and a condenser mounted thereon andconnected to a terminal strip, the cover of the wall telephone ,carrying talking equi ment comprising a transmitter, receiver, an hook switch; also connected with a. terminal striE,v

and the desk telpslone carrying similar tal ing equipment connected to a terminal strip, and jumper cables forv either connectconnecting facilities for connecting the base. and cover terminal strip to form a wall telephone.

6. As an article (if manufacltidre, atltructure comprising a ase` uip wi -si nalling equipment 'usableeiii common in boi desk and wall telephone sets provided with a terminal strip, a cover for said base ca ing the talking and switch controlling mcrlliamsxn of a wall telephone, and also carrying a terminal strip carrying a terminal strip, an means -for interconnecting the terminal strip on the base with the terminal strip on the cover to form a complete wall telephone set, or for interconn said first terminal strip with the terminal strip of the desk stand to -fonn a complete desk telephone set.

S' edat Chicago, Illinois, this 27th dayv of rch 1922. Y' Y AJOHN ERICKSON. S' ed at Chicago, Dlinois, 27th day of rch, 1922.

/f/ HERBERT F. .OBERGF ELL.

a desk telphone stand, 

